In exchanged for Frei, the Sounders sent Toronto a conditional 2015 first-round pick in the MLS SuperDraft. Further terms of the deal were not disclosed.

Goalkeeper Stefan Frei yells at his Toronto FC teammates after he was scored on by Chivas USA during an MLS match Sept. 24, 2011, in Carson, Calif. (Victor Decolongon/Getty Images)

“Stefan is a goalkeeper we have liked for a number of years,” Seattle head coach Sigi Schmid said in the club’s announcement. “He is a quality professional who brings experience and leadership to the position. Adding Stefan at this point in his career was very attractive to us.”

Frei, 27, has been playing Major League Soccer since 2009 and was Toronto’s all-time leader in game appearances with 99. But he missed the entire 2012 season due to a serious leg injury, including a broken fibula and torn ligaments in his left ankle, that required season-ending surgery. He wasn’t able to return until October 2013 and ended up playing just one league game for Toronto this past season.

The 6-foot-3, 195-pound keeper has 19 career shutouts and had a 20-35-25 record with Toronto, making 314 saves on 452 shots. Two of those shutouts, the Sounders noted, came against Seattle.

Gspurning, 32, had been on the Sounders roster for two years and was a finalist for MLS Goalkeeper of the Year in 2012. But he regressed in 2013 and was replaced by backup Marcus Hahnemann by the end of the season.